LM5069: LM5069

Farzaneh Faridi

Part Number: LM5069

Esteemed Seniors:

I tried to simulated the LM5069 evaluation board in PSPICE, but the result wasn't what I expected.

the voltage that could be seen in UVLO (1.142u) is so weird, it shows a short circuit and it can't be that much low. On the other hand I expect to see the current at the output limited by the LM5069 but I observed the graph below:

NOTE: I used LM5069 TINA_TI model and it's working quiet properly there, I want to know why I can't see the same behaviour in PSPICE. Why we can't work in PSPICE as the way we can using TINA. Is there any issue with the PSPICE model of LM5069?

and this is what I saw using TINA:

Regards

Farzaneh

over 6 years ago

0 Rakesh over 6 years ago

TI__Guru** 107891 points

Hi Farzaneh,

Welcome to E2E!

Can you please make R15=1k and check.

BR, Rakesh

0 Farzaneh Faridi over 6 years ago in reply to Rakesh

Intellectual 635 points

Thanks for your prompt answer,

I checked it before with 1K, but what I see is not possible look at the figure below:

How is it possible to have 1.7 KA at the drain of sup70060 o -1.7KA at its source?

Regards

0 Rakesh over 6 years ago in reply to Farzaneh Faridi

TI__Guru** 107891 points

ok.

For this setup, provide me the Vout, GATE, Timer voltage, input current waveforms.

BR, Rakesh

0 Farzaneh Faridi over 6 years ago in reply to Rakesh

Intellectual 635 points

I've thought it might be a good idea to have a zoom view as well:

0 Rakesh over 6 years ago in reply to Farzaneh Faridi

TI__Guru** 107891 points

Thank you!

Can you share me your simulation file to run and then see what going on..

BR, Rakesh

0 Farzaneh Faridi over 6 years ago in reply to Rakesh

Intellectual 635 points

Of course, I made a zip file of whatever I had.LM5069_Simulation.zip

0 Rakesh over 6 years ago in reply to Farzaneh Faridi

TI__Guru** 107891 points

Hi Farzaneh,

Run for longer duration for example 2s. I have below output from the simulation

BR, Rakesh

0 Farzaneh Faridi over 6 years ago in reply to Rakesh

Intellectual 635 points

Hello Rakesh,

I've changed the time for transient simulation as you said before, but there is an error which I can't understand it. the simulation stops at 1.482 s with this error:

Have you faced the same error? I couldn't understand which component causes this error and is divided by zero. Do you have any Idea?

Regards,

Farzaneh

0 Farzaneh Faridi over 6 years ago in reply to Farzaneh Faridi

Intellectual 635 points

Hi Rakesh, I've just done an AutoConverge simulation and problem is solved,

Thanks a lot for your help

Farzaneh

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LM5069: LM5069